Improved mode of polishing artificial teeth



Staten gawt (lt SIDNEY'B. s'ILL, or THREEA RIVERS, MICHIGAN.

Lettcrs'Patfmt No. S'l,30 3,fdated Februar/ry 23, 1869..

" 'waeren Munn or' PoLrsHmG ARTIFICIAL Tauern.

T119 Shedul'e referred to in these-Letters Patent and making 0f the lame.

To all wir-om fit may concern: Be it known that I, SIDNEY B.- SILL, of Three Rivers, in the county of St. Joseph, and- State of Michigan, have invented a new and valuable Improvement' in Means for Polishing the Lingual Surfaces of Tooth- Plates yand I do hereby declare that the following is afull, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification,

and to the letters and figuresof reference marked thereon.

Figure l of the drawings isa representation of a side view. of the dies used in forming my metallic plate;

Figure 2 is a sectional View of the same; and Figures 3 and 4 are details.

rlhe nature of my invention consists in providing bet` ter means than have heretofore beenused or known, for smoothing and polishing the lingual surfaces of artificial-tooth plates.

It is well known that in the process of polishing the lingual surfaces of India-rubber tooth-plates, the operator has been confined mainly .to the usefof Scrapers, nies, brush-wheels, and the like, and as a consequence,

the polish, if effected at all, has been made with great labor and imperfection.

It 'equently happens, also, that by reason ofthe ineffective means abovereferred to,the plates are used with a verydet'ective polish, causing uneasiness and irritation to the tongue.

To remedy thisv evil, I take a metallic casting from the original gypsum form, which said casting is represented on the drawings by letters A andB.l I then take a thin sheet of metal, and swage it between the parts A and B, and thereby impress upon it the exactconfiguration of the lower surface of part A, and the upper surface of part B.

ings, and it is represented after the swaging-process has been perfected. l

I next take .the yplate O and place it upon the lingual surface of the gum-plate, while said plate'is undergoing the process of cooling in. the ask, or vuloanizer, and press it firmly, but gently upon the same. AAfter this adjustment, I allow the gum and plate to remain until the former becomes thoroughly cool and hard, when I throw the plate away.

By this means the surface' of the tooth-plate, upon which the plate C is placed, becomes beautifully polished and smooth, without the use of anypolishing or smoothing-instrument whatever. g lVhat l claim as my invention, and desire to secure by Letters Patent, isv 1. Swaging a metallic plate between dies, to provide means of polishing the lingual surfaces of Indiaf rubber tooth-plates, substantially asdescbed.

2. The plate C, prepared as herein specified, substantiallyas and forthe purposes set forth.

In testimony that I claim the above, I have hereunto subscribed my name,in the presence' of twowitnesses. Y A SIDNEY B. SILL.-

lVitnesses:

JNO. S. MOUREY, A. H.' CARTER.

This thin metallic sheet is marked C on thedraw- 

